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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6740634bcfbce7c379f4114f34ec70434b5412ae1962fb8c1e50946ada85db2' 
  AND token = 'Xkz5E5p+rpcXEScpULrxs0qWKf3DJBgU+rx2aQcpgZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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