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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7211f0d5567b4ad865a6c19a95c9ed1054263ab6fcbe735bbdc514a28e281e9a' 
  AND token = 'QV17qxievA0TzFTuXdgAnwHxqp2EW4aSYYKp5lMYy3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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