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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb08b91d8fa52ba354c1c8f74b7197d2776f6e7f4752e84deeecb3abf119f4c' 
  AND token = 'ghtjTx0mA72sTZaTUd2ozF1m+7mei9lNdhzZee9oYL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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