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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2338e35579bc7ed4a0b593a1687f5c00c7d90878b9860d49f69cb98d67f7e9d6' 
  AND token = 'myZLBh9hp+pU6yef66YOrmBoeuB8BntHI/5wKGIHxyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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