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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5febf9099496a6945b761e610c9c9e719ee81ecda718993a50e562ec899425bd' 
  AND token = 'kB5DOk2IOAdcXnwQPdute/NRF1nAJyB8rZinEIJFf4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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