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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b928f86bc85edb8e4f2eb3b3af5756ec1fd252310827b75144fae36cb0369b95' 
  AND token = 'XmG6y34nC2jOGNQaQmOZ5fqI6j1cqrk/ycsKr6w1kg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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