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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adf1ad5a58ab83ced36e0fd932a6bcd5c081fb4d8f64866d9e4de6ca1f392ce' 
  AND token = '2kfYD5JxgyiZIW76/g285RtGVLxjaivdLF0S5ERVzw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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