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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7ff33af3b97cfd0b9bc34705972f91e62f589c86fb7d2df24d5077babb9cba' 
  AND token = 'TF38CQVhOf971anwE7oOoa3hjOXd9l3sA2dH2DJM0Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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