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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81abcc1e2a660b0430749e26c6f3519bc1f6f18398ed482cf7d2d39ec332e1c7' 
  AND token = '/p2wiyw060KqxceuWLaTHYnNgajoZrx1/DDbMbetCmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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