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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11652fef098f701c895863967fb6b178fff3b73fe1b04c020c49f715d02214a3' 
  AND token = 'hsf/eL0zm9Q+1GfDCn14fZQg0dgTngDcBQvAmptYFmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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