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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c38ad2bda7ffc8b4c6bfa83504884f569ed5f3d2ddd07f2732ff955a73e5fd1' 
  AND token = 'jS0ML7lpcGNA9eVQJF2QkQSsODlITSU3Y+T9W12EvMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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