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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e875faa32ed703eb9887217ab8a59cca5bc34c0d3841f7c46ec1ca7759a492' 
  AND token = 'ggSuClo9Uikm69O8WWQLIuXYuAZbdWpeXPgwDd+V/8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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