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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885cc2879c30ac265f5994e41198db95bd84cbfed07e7ec8b79c0e2659c9118d' 
  AND token = '5PN7XGCidPI1g1N/7/6bAOr64vMr6/3JeTmPjOxsn5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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