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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b76c8fa75ece1ae7161207e5a2f746b9f261b9ae2b38420c4a84047c4c7fd2b' 
  AND token = 'liH/XrnNhwQkH74Hz3hnyoaOd1d4XKPTEutrvQejAgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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