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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0b4c753e28827893e98a56011158b6a41152edc3949ea223001fe04993a5ff' 
  AND token = 'Orz093cdCYjbf5rhTeYuMO3v9ZtAobb3ch2uWsSt6+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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