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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa15bd9ac0e3ba417c40758c8b7ccb899a959234f59f6332bd544f9a2737d988' 
  AND token = 'JQdh+NLFdF85nagL5PS9A3g7Yl45FXtp7Ft6KjB6jMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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