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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9238bbd5b88ab3a6cd47ea91c06babb680ea5c1e0c341596b9205e7960fa404c' 
  AND token = '7m9nOa/Le2CH6IUHy5lKQj2/kjY/Svn8v6kdBhB2IAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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