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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afb3eaf1e46cc270259e51ab1e7ebb6e5d9a516e90f54f4c9c7ed5c6ec081ce' 
  AND token = 'H3gvhsZvByMeHUd6IKDGFOSnB8kFGpyW9aEv5cQBRzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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