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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0998f2ade107af5aa7e35dbb8bb79c2161115f163b182aa1df11b98fd6a64f' 
  AND token = 'oottbjXvzgodi+lAI6a1QBC9eU0wQFZigsxEDY5CRNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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