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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d6fece58a9a0bf8665fef7a642d58f4b94a575cefb28232e79d0b68944d0af' 
  AND token = 'eEEwceWJX5weLz95mQeGrmBfB0xjKMsXmH8lMHwDdTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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