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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32e349b2ee99417417252a54304987d53ede5f3bac6cc48179e698381b64b0f' 
  AND token = 'spsZ/GYn3imqZ+fd7Ctaci86LDhF4D29mD99fXJRA5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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