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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ebd09b37b182c79be3b589e2e9b1db93f9de179555e7ad3a3078998208cc6f' 
  AND token = 'LSdLIWgaWU2shaF1BG2YN4c4BRgxO99cSldjX3IwmG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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