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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b169f8746e63b3335ff8fdb56dffef4bc92d71a7674e9045f430f3959596ce3d' 
  AND token = 'SVkGHTSniV1mpgS3cEooM5Sh8aIQrMM7zUD7eTnvFiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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