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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7490d938ba96e0629335f8bb9f0fbac84da9ba6e782dad092a5eb3eeecd75208' 
  AND token = 'TaGSG662xg4cJ0sQFV1yuih30sFy75gOD9Qg6pX+FRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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