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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fe825487be4ec0b5eb5fac6d72a3326ecd8b79116b1d1b7ce111bd64d109fc' 
  AND token = 'e2iu2XeuRkqiMkXkrs2VOCqFcF/wdWXZ3VVSlt1Q6Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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