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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e46ea9dc3a97e9ae5f84d7cb800267a595926bc5ed9ae8cc3cbd951d2d901c' 
  AND token = 'zfaSBzRJirrMnSdFMxUaDeq5iIMRthlNP1ZDAadvRPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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