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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c53a70d37d0598a5cf8a9d4d2d21d4e89bd6e9ea7d1569c4a35e13dc8d4f68a' 
  AND token = 'zzUnUS7YmFVGCEgEr/7TFW8X6rMoQrl3d/z7N9WndJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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