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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7a987a979c3011657ac0372ebae30e4a968d6f1d78408eb966d1461e9e92ec' 
  AND token = '9Ht4FwW/l65wBcIE5PLi5D8fUtIxxehn5YtPn3Lbgmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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