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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7147ede402ab70bd103bccf67b4f90f2c8bad888d5036e167a8e5fc8ab607b' 
  AND token = 'gI26yxNG91ezUy41XFc1bqvYD6Lq30Uuu4D67RAS59Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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