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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6948081ceb4c04ebd8b3c98d203e4115c8499238707aaa43d3f168c3e28579' 
  AND token = '6rYnxhl0URHlr5y5F7FqYGJNS31zOH3MxFmLY9qiLyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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