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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809a5b4ddcf840f2cc7b2bbdc42a2f3d9f397ad09b10d3501bb3ed7ad4f235b1' 
  AND token = '4mDWmvccMc8fdqtQfaJ6KblWg2PcaXuMuklADPuUrao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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