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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b619e1451119efdd4a6e1122e043d4cd490846e55e99ac5810c4861f0c39a32' 
  AND token = 'vVSCtZnM9MthLyp2EaVJ/5TB6hZL3pOIO4KgseCctEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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