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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cf78baa0edb6b79e581afc5a221aacf5c28509630bb849ac305ceae4484cc5' 
  AND token = 'pLNy9K4qD7XSdYP0pvsj0BB5VkQBouuneZTPI1I/p2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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