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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de03342eec266a3a8bb813cab19cbb84ef5fca7cbd4c47cc32c792cec9f7f206' 
  AND token = 'qOK9lSv60mtGlPSyevW+dNIFgZop+gWyUHUrwyOx+RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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