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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b109d99040e00e94dced032f1c77a180466d758a9882e6ff1ab3fefad2925115' 
  AND token = 'FnD9WWm6xv8BIxnO83YHiJCwn6bVzebFt7nw8M6YWEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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