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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f87670054e8db73868f0bd57c575b638067ccdd18b752bc8bd0db62ab20dc6' 
  AND token = 'b8kYkGvwLSLYlZU/6SphlYnfQjqSwh/0IfYQ4TvCct4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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