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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e71d43af52ffab895960dfb5d9a37446584166e886c44d9bb9b79a543fe41a' 
  AND token = 'XkbWlFtD2YOTxtkp44ngrYxOBSIogm/A6U6PUcWj2Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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