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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8fb4ec7599d303b2444e819bc90d4afc7f0ade8dcd05a810c36f15fb306098' 
  AND token = 'L46fODm5l2MS38HbMy9JLy6fOgJ9Ju8HHdKmY24xI78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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