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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4970a20d4c2584f1c81a6bfedeca511a61fb859e80c0bf32ca441199d36e6380' 
  AND token = 'AhOdPjZOcd4ON0MXIPQtLJNTWLzXvE8jpenycgSi0dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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