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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec32eaa565d6bdb919ce688659dfb2f50c104bca70fb9ca5ef79407bd6154985' 
  AND token = 'xuGa4qsqjxlQsLlHIdbRZAmUN7b2jbn0mrkyavXU/P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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