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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebffe88d871bd12d48f9c366c2a84b8c200bbcf505147c4c7381836d5c7c90c' 
  AND token = 'cpjyhQxMcWjcU4IN/8GvyAY+uP6xkP9O2xlivCGfs6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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