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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d26ad7e9bef3651499f8de21a8a88f0bf4dd71e917900146b93fde2f5a266c1' 
  AND token = 'X4Z6RQGDfbRZyw2Z+1H55pjnpAaH32THICEz7gp8eco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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