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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7daf4de33be4ac56d7592912aff5f1c945095153e6df9247d660fbf096ab85' 
  AND token = 'ukFwpGPgEHMbLkjL7Wgr9kPYgW012NW0BpbqCsm5xJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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