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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffa804b1965066b9456309e9fd7b6d0ece744a9c3e922957741fcf35793dec7' 
  AND token = 'e5ZFQC0mez61Y9bu1vNYvh26c3WGNoY/Mnw0OraFpno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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