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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dea2f8b9de6825ddb3f0c2da2498274b314194a0282bbd896f94fd135fa179' 
  AND token = 'S4N+HxvikcwtiuRfN+eUolbPs1eQiztIeVfIOx/PSIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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