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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febaae9b834169ea169afea2fbd1f48e381cefc3a46d126c8345dae7c00f600c' 
  AND token = 'lh9gCgQmrTUe+ErNDmQc+zHs8cnJ8z91k75sICkcYoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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