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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a3a05b1b67f2005be4075ebe3a5a3bf36a75454c7d99b6388d7905c64ff5f6' 
  AND token = 'jkXaCYKVg402Hf3yvuxkicNSoT7KHJ2UmvqrcGUdvEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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