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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d67d3acf1c7f110f1f86ae386c609f291a34518ce885241f5505a94b7181ac0' 
  AND token = '1SKThVfIyUWmJ7T3eHmE/wPjORqM7+wDsZfdlywe7A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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