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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac40f968846c43264dd2b61f4168a3a64d773fcfaf902c79f3968d3cf8cb4e2' 
  AND token = 'P9u7Swoemlcy7gzVRb3rt3uMYDskOgZYFMFbpai5nzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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