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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420b3c1003bc66a99daf0f4951af3c7dfc010171aa6a5da92ede6cbdf2ebf1e7' 
  AND token = '7cQO79Mlo6qiqYlKIGbXF0ODmNyuzCeIkuRvgkyaQ2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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