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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ac2158b5fc24954f93a9755882306dfd93b30f1fc3cb8a9acc49b24f35618f' 
  AND token = '731MbrCUjIxt7TcEQtZC8vSzCdCj3ZuUUWLpYLBMab0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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