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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30c99b2c65c31772ee0718fe67632b3846a39c0f45af8b22ed27eb2dfdbd53a' 
  AND token = 'M9BRVx3QlTTMQPsd67IF6YRXNHDF9gO56JT74sJC5y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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