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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13f4ee6f80cd7b85d8b07db822afc672400a342f9debbbd7ed5ee9cfa83f6a0' 
  AND token = 'TUTrGlZFn6K5nFLsqg55kBsX5OQRSBrtQyLaZeC8rLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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