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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e553c7a29f8b6da95cf68c2db972b01c8be2db60a156aab2eaac46c1198e3d' 
  AND token = 'CNN8sUwr+JCuNbTXJ2q+K1myVfuTR0IubzI9wfJcYSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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