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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3171b7fdf4829c114e6b75d42411159adee0ffe64f111cd7f471f660373e59' 
  AND token = '6ZYqYgik6h6IFu/F4QK6OJXtxmk6ezpxJNeGrMCsp3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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