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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2e4693a6ce240efa626629b781caf0a6c6a2cd512dff1261d4a6866d8980a5' 
  AND token = 'dauNYJJXxfijC4wnrRq45NX/HZuKid74ob5VjRmj6Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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