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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40be30a4c5a9f932a977809d078e8c36017decedfa6b873169d6d35338f8b37' 
  AND token = 'OmgGVC3EjI+Ty2upmHNfTYF989EkbOBmUPqlFbbaAeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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