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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65048d1c98878597978a8fa746e99926cbe134b4d0e37c260c6ce79da5cef71' 
  AND token = 'h65fk2bMPa0kR6vUGJ5MyN8Yo+L61q0/e88GXR2o7kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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