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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6ca111d73170b69bd0c50ba09e8b936009eb60194b5c4e31f484ab8af8b7c7' 
  AND token = 'Q/G8Vv0TV1aqyTAPNQ7DI3lyxnKezylk7fhYc3oxk0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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