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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8209158d5f06e864ec90c1c2013c3e7e971fe41608e29364d9db4587ef1a703' 
  AND token = 'qUguS8j0s3egoRsQLM/Gd+ky76/F3Av2jZ3J6oOYf/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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