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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f8d7bdcc04c140dd99ca707cf1e0b88113659daa159e4eca22c79deab5e0fc' 
  AND token = 'TpFpPG6xVrg5ut0fmwXuFByVo2Dvi6/32zonE5I06lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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