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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fae46dadbcb0bdebecc2b64345dfbeff39ea50b6a88d589a363b0350ea7c4fd' 
  AND token = 'KN74M62/jIfzwllOTzjVR3wQ2C8pu4Util+EDbm1Zns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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