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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf71142186e1b8a60224a9f449182bcfaccbdbc52c5dfd8ddad793e763e4eab' 
  AND token = 'UgQGMTq0B5SzHP1KVfWs1SoyOINLb7n4+82rCboGafw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}