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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3de6b3c9fd819801338a36d6b651e9f6212c7becce7c08a9a7bc6dcc5be057e' 
  AND token = 'LfBgHJJ5JMkw6psjXzWKKJLIJlSuLCy6hlZhO5zwnAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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