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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512132359c6c0e0dedf60b11189b834add805f0d86485de9b6b5e9d107994bfa' 
  AND token = 'bF0fnV4Z+blYq6UixhmBdxc/pjSyHqaOvDYFih2cSq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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