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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8658824e49baf91eb7790bd6de42b3ce457201040c5b98ecf0dcfc3ce2f23b' 
  AND token = 'vziYSUo9lXP0k2JrdcmLDahe//ojZR+7EeuZY5Ze4Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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