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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ac194ed5ed708f98eb4510b53009da20e0ab9e2e0de516ac32e3cf27a34520' 
  AND token = 'p4/OIdaRSyduRh+YPw3x+uOLg3o/bB/brPPPn/gWxzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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