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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc31c073e4b12add75fb95c808619bb2dfede6ee17204c33b4407f6d9f0e1182' 
  AND token = '9LQqiOLUuDOXy1Gpj3BPgdaDqS6bB3T9D95UXx6efns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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