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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965d4a931b2e3444ffd05ac60f7f9f59c9d9a0749a1f24dc6aad9d6814b1b1b1' 
  AND token = 'YhAGV3lxTieO+7Sk/e11AdQytbH8ngq2qla7YJVrVOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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